Eudolph c



(No Model.)

R. 0. SMITH.

VALVE FOR HYDRAULIC ELEVATORS.

No. 339,816. I Patented Apr. 13, 1886.

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RUDOLPH 0. SMITH, or YONKERS, ASSIGNOR TO OTIS BROTHERS a co., on NEW YORK, N. Y.

VALVE FOR HYDRAULIC ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 339,816, dated April 13, 1886.

Application filed November-111F851. Renewed Octoherfll, 1884. Serial 1Y0. 146,229. (No model.)

To all whom, it may concern.-

Be it known that I, RUDOLPH 0. SMITH, a citizen of the United States, and a resident of Yonkersflvestchestercounty. New York, have 5 invented certain new and useful Improvements in Valves for Hydraulic Elevator-Engines, of wh ch the following is a specification.

My invention has for its object to prevent the noise and other injurious effects resulting from the discharge of water under pressure into pipes, through which it is conveyed into tanks or other receptacles; and my invention consists in means, fully described hereinafter, whereby to maintain a pressure in the receiv ing or discharge-pipe about equal to that in the vessel or pipe from which the water is discharged.

In order to illustrate my invention I have shown,iu the accompanying sectional drawing, sufficient of an Otis hydraulic elevator to explain the difficulties resulting from the discharge of water under pressure and the mode by which I remedy them. It should be understood, however, that my invention is ap' plicable in any case where water is discharged under pressure into a conduit.

The cylinderA contains the usual liftingpiston,l3, and communicates at the upper end with a circulating pipe, 0. at the lower end, through a pipe, H,with the casing I, containing the usual piston or water-discharge valve,

J, and the lower end of the circulatingpipe also communicates with said casing, all as in the Otis elevator above referred to, the construction, arrangement, and operation of the parts being too well known by those skilled in the art to require further description.

In the class of apparatus above referred to' it is found that the flow of water under press- 40 ure from the spacer/v beneath the piston through the contracted opening afforded by the partial lifting of the valve, and into the dischargepipe K, (where there is frequently little,if any, pressure,) results in a loud whistling or hissing sound, which is not only disagreeable but objectionable in other respects. This effect results from the difference of pressure in the space w and pipe K, and I have found that it can be overcome by equalizing the pressure in the said places. To effect this result, I place an automatically-operating valve, a, at the end of the discharge-pipe and below the surface of the water in the tank L, which valve, while it will yield to permit the passage of the dis charge-water into the tank, will throttle the discharge opening to such an extent as to maintain the water in the pipe K under pressure either equal to that in the space a: or so nearly the same that its flow from one space to the other is effected without noise or dis- 6o turbance.

The automatic lifting of the valve a toward its seat may be effected by any of the usual means; but I prefer to connect the valve to the stem of a piston, b, adapted to a cylinder, M, which communicates through a pipe, N, with the space or, so that pressure in the latter will act to close the valve against its seat and impart increased resistance to the action of the dischargewater in proportion as the pressure in the space 00 increases.

To properly regulate the action of the valve, I provide the pipe N with a cock, E; and to equalize the pressure upon the valve J, I connect the pipe K by means of a tube, D, with the space in the casing I above the valve.

Should any accident occur to the valve a the water may be cut off from the cylinder M by turning the valve E.

Without confining inyselfto the precise const-ructiou of parts illustrated and described, I claim- 1. The combination, with a water-discharge valve and with the discharge-pipe leading therefrom .in a tank, of an automatically-op erated regulating-valve arranged at the end of said pipe within the tank, to throttle the passage of the discharge-water and secure a pressure in the said pipe about equal to that in the space or chamber through which the water flows to the discharge-valve, substantially as described.

2. The combination, with the dischargevalve, discharge-pipe leading to a tank, and regulating valve at the end of the latter within the tank, of a pipe, N, and means, substantially as described, whereby the water from the space or chamber through which water flows to the discharge-valve is brought to act upon the regulatingvalve, substantially as 10:) described.

3. The combination of the discharge-valve,

discharge-pipe leading to a tank, regulating- I and secure a pressure in the said pipe about valve within the tank, and pipe D, connecting equal to that in the space or chamber below the dischargepipe and space above the disthe piston of'the elevator, through which the 15' charge-valve, whereby the pressure on said water flows to the discharge-valve, substan 5 discharge-valve is regulated, substantially as stantially as described.

described. In testimony whereof I have signed my name 4:. The combination, with an elevator-cylinto this specification in the presence of two subder, water-discharge valve, the discharge-pipe scribing witnesses.

leading therefrom, and a tank, of an auto- RUDOLPH 0. SMITH. 10 niatically-operated regulating-Valve arranged Witnesses: I

at the end of said pipe within the tank to L. H. JOHNSON,

throttle the passage of the dischargdwater F. CROSSMAN. 

